pretty_print_log.php

<?php
function log_error_msg($msg)
{
    print_r($msg);
    $_log_message[] = $msg;

    $info = debug_backtrace();
    $space = str_repeat(' ',4);
    foreach ($info as $i){
        $file = isset($i['file'])   ?   $i['file']  :   '';
        $line = isset($i['line'])  ?   $i['line'] :   '';
        $class =isset($i['class'])  ?   $i['class'] :   '';
        $function = isset($i['function'])   ?$i['function'] :   '';
        $sep = isset($i['object'])  ?   "->"    :   "::"    ;
        $_log_message[]= "$space in $file:$line $class$sep$function()";
    }

    log_msg('[error]'.implode(PHP_EOL,$_log_message));
}